Fluid pressure pump or motor



Patented Dec. 22, 1936 NED STATES PATENT OFFICE 1 Claim.

My invention relates to fluid pressure pumps or motors and its principalobject is to provide a pump of the rotary type which is simple inconstruction and especially economical to manufacture in the smallersizes, so that it may be sold very cheaply for use on the farm and inother isolated places where the cost of installations of the presenttype would be prohibitive.

It is contemplated also that my invention may be equally adapted for useas a motor to be driven by compressed air, water, or other fluidpressure, but in order that my said invention may be understood by thoseskilled in the art, I will now describe the same as applied to a pump,reference being had to the accompanying drawing in which- Figure 1 is aside elevation showing my improved pump connected to and operated by asmall gasoline engine A of the air-cooled type, through belt B andpulleys 28, 28'.

Figure 2 is a vertical section of the pump taken in a plane at rightangles to the axis, and drawn to an enlarged scale.

Figure 3 is a horizontal section on line 33 of Figure 2.

Like characters designate corresponding parts through the several views.

I is the housing preferably formed of a single casting and having acover 2 secured to it by 30 bolts 3 which pass through lugs 4 integralwith the housing and through corresponding lugs upon the cover. In onepiece with the housing is a base plate 5 having bolt holes 6 by which itmay be secured to any desired form of base or 35 support.

Integral with the housing is an inlet connection 7 and also an outletspout 8. The inlet connection comprises a port ll which communicateswith the inside of the housing and terminates at 40 its upper end uponthe internal bore II of the housing while its lower end is provided withan internally screw threaded socket 12 adapted to receive a suction pipe13. Within the socket I2 is also an annular seat it adapted to receive aspherical check valve member 15, the upward movement of which is limitedby the transverse pin 76 as shown in Figure 2. Hinged at l2 to theinterior of the housing is a valve of the flap type !3 provided with aninner facing M of rubber, leather, or other suitable material, the innersurface of which is of arcuate form having the same radius as the bore Hof the housing and adapted to form a continuation thereof when the valveI3 is in its extreme outward position as indicated in broken lines atl3l. Upon the outer surface of the valve I3 is a projection I5 withwhich engages one end of a helical compression spring Hi, the other endof which is seated in a pocket I! formed integral with the spout 8. 5

Centrally disposed within the housing is a shaft 18 mounted in ballbearings I 9, 20. The outer races of these bearings are secured withinbosses 2|, 22 respectively upon the housing by means of the covers 23,24, while the inner races are 10 secured upon reduced portions of theshaft by nuts 25, 26 in the well known manner. The cover 2 3 forms acomplete closure for the opening in the hub 22 while the cover 23 has acircular opening through which passes the shaft ex- 15 tension 2'! uponwhich is secured the pulley 28 or other desired form of driving element,leakage between the cover and the shaft being prevented by felt or otherpacking 29. Mounted upon the shaft l8 and secured thereto by the 20 key|8| is a rotor 30 preferably formed from hard rubber, bakelite or otherof the well known plastic materials. The rotor is provided with flatsurfaces adapted to fit against the inner faces of the housing and thecover while its 25 periphery is of cam-like shape having a smallconcentric portion 3| spaced apart from the inner periphery of the bore1 l and also a larger concentric portion 32 adapted for sliding contactwith the said inner periphery, and inter- 30 mediate these large andsmall external surfaces are spiral or other cam-like portions 33, 34,the portion 34 being of gradually increasing radius as shown, while theportion 33 is of a constant radius similar to that of the bore I I, sothat when 35 the rotor is in the the position shown in Figure 2 the saidportion will make a perfect contact with the facing M of the flap valvel3.

The operation of the pump is as follows-Commencing with the parts in therelative positions shown in Figure 2, and the rotor 30 being caused torevolve, together with its shaft, in the direction indicated by thearrow 40, driving before it the fluid already contained in the spacebetween the rotor and the housing which is discharged through the spout8, the spiral cam portion 34 acts upon the flap valve l3 and graduallymoves it outwards until it occupies the position indicated in brokenlines at l3], the large radius peripheral surface 32 of the rotor thenmoving across the inner surface of the facing l4 upon the valve. Theportion 32 then leaves the flap valve behind and allows it to moveinwards under the action of the spring l6 so that it again occupies theposition shown in full lines in Figure 2. In the meantime, a furthersupply of fluid has been drawn into the casing through the port H, aswill be understood, and the cycle of operations is repeated. In thismanner a practically continuous flow of fluid is obtained, varying inquantity according to the dimensions of the pump and the speed of therotor which will be ranged to suit the purpose for which the pump is tobe used.

While I have herein described and illustrated .a preferred embodiment ofmy invention, it will be readily understood that details of the same maybe varied to suit any particular requirement without departing from thespirit of my invention as defined in the appended claim. Furthermore, ashereinbefore mentioned, my device may be adapted for use as a motor, butI have not shown or described this form of the device since theprinciples involved in such adaptation are Well known.

What I claim and desire to secure by Letters Patent of the United Statesis:

In a pump body, the combination, with a housing having a cylindricalbore and having one end integral therewith, of a rectangular dischargespout three sides of which are integral with said housing, and a coverupon the other end of said housing having an extension adapted to formthe fourth side of said spout, and a cylindrical inlet connectionintegral with said housing and positioned below said spout.

ALFRED NITTKA.

